A new mass conservation approach to the study of CO<sub>2</sub> advection in an alpine forest

Montagnani, Leonardo; Manca, Giovanni; Canepa, Elisa; Georgieva, Emilia; Acosta, Manuel; Feigenwinter, Christian; Janouš, Dalibor; Kerschbaumer, Guenther; Lindroth, Anders; Minach, Luigi; Minerbi, Stefano; Mölder, Meelis; Pavelka, Marián; Seufert, G.; Zeri, Marcelo; Ziegler, W.

doi:10.1029/2008jd010650

Cited by 77 publications

(60 citation statements)

References 120 publications

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“…In this study, an improvement to the Montagnani et al (2009) correction approach is presented. As in Montagnani et al (2009), the methodology is based on the non-simplified CO 2 balance equation, but we concentrate on the assessment of the advection terms.…”

Section: Introductionmentioning

confidence: 99%

“…The present study describes as a test case the application of WINDS (Georgieva et al, 2003), a mass-consistent flow model, in the methodology for the calculation of half hourly averaged advective flux terms, presented in Montagnani et al (2009). We use data from the ADVEX campaign at the CarboEurope-IP site of Renon (Bozen/Bolzano Autonomous Province), in Northern Italy (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…As in Montagnani et al (2009), the methodology is based on the non-simplified CO 2 balance equation, but we concentrate on the assessment of the advection terms.…”

Section: Introductionmentioning

confidence: 99%

“…Goulden et al, 1996;Suyker et al, 2005;Moureaux et al, 2006;Zhao et al, 2006); and (ii) the "correction approach", based on a direct estimation of all the CO 2 balance terms, including the advection terms (e.g. Aubinet et al, 2003Aubinet et al, , 2005Feigenwinter et al, 2004;Staebler and Fitzjarrald, 2004;Marcolla et al, 2005;Sun et al, 2007;Yi et al, 2008;Montagnani et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

“…A detailed description of the flux measurement system is given by Feigenwinter et al (2008). Montagnani et al, 2009)…”

Section: Introductionmentioning

confidence: 99%

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Application of a mass consistent flow model to study the CO2 mass balance of forests

Canepa

Georgieva

Manca

et al. 2010

Agricultural and Forest Meteorology

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The reconstruction of the wind field is one of the main issues in the mass conservation approach for calculation of CO 2 advection in forest ecosystems and still remains a challenging problem. In the current study, we present an advancement of this approach: the use of a mass consistent flow model (WINDS) which takes into account measured wind data and simulates the 3-D flow field, while imposing air mass conservation in the control volume. We apply the WINDS model to calculate half hourly mean total advective flux terms at the arboEurope-IP site of Renon (Bozen/Bolzano Autonomous Province), in Northern Italy. The data used refer to six time periods of one day representing three different meteorological conditions observed during the ADVEX campaign from April to September 2005. Current results are compared with results obtained in two other studies for the same time periods. One of these studies is based on the mass conservation approach as well, but applies only interpolations to reconstruct the wind field; the other study makes use of tilt correction (sectorwise planar fit method) for the vertical wind component. In the present study, the effect of the wind field reconstruction method on the estimation of the advective fluxes is discussed. The possibility of using reduced input wind data (i.e. number of towers) for WINDS is also investigated. The results suggest that the representativeness of wind tower measurements is of primary importance for estimating CO 2 advection terms and their uncertainty in complex terrain.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…As in Montagnani et al (2009), the methodology is based on the non-simplified CO 2 balance equation, but we concentrate on the assessment of the advection terms.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…A detailed description of the flux measurement system is given by Feigenwinter et al (2008). Montagnani et al, 2009)…”

Section: Introductionmentioning

confidence: 99%

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Application of a mass consistent flow model to study the CO2 mass balance of forests

Canepa

Georgieva

Manca

et al. 2010

Agricultural and Forest Meteorology

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Global parameterization and validation of a two‐leaf light use efficiency model for predicting gross primary production across FLUXNET sites

et al. 2016

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Light use efficiency (LUE) models are widely used to simulate gross primary production (GPP).However, the treatment of the plant canopy as a big leaf by these models can introduce large uncertainties in simulated GPP. Recently, a two-leaf light use efficiency (TL-LUE) model was developed to simulate GPP separately for sunlit and shaded leaves and has been shown to outperform the big-leaf MOD17 model at six FLUX sites in China. In this study we investigated the performance of the TL-LUE model for a wider range of biomes. For this we optimized the parameters and tested the TL-LUE model using data from 98 FLUXNET sites which are distributed across the globe. The results showed that the TL-LUE model performed in general better than the MOD17 model in simulating 8 day GPP. Optimized maximum light use efficiency of shaded leaves (ε msh ) was 2.63 to 4.59 times that of sunlit leaves (ε msu ). Generally, the relationships of ε msh and ε msu with ε max ZHOU ET AL. were well described by linear equations, indicating the existence of general patterns across biomes. GPP simulated by the TL-LUE model was much less sensitive to biases in the photosynthetically active radiation (PAR) input than the MOD17 model. The results of this study suggest that the proposed TL-LUE model has the potential for simulating regional and global GPP of terrestrial ecosystems, and it is more robust with regard to usual biases in input data than existing approaches which neglect the bimodal within-canopy distribution of PAR.

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Low historical nitrogen deposition effect on carbon sequestration in the boreal zone

Fleischer¹,

Wårlind

Molen

et al. 2015

JGR Biogeosciences

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Nitrogen (N) cycle dynamics and N deposition play an important role in determining the terrestrial biosphere's carbon (C) balance. We assess global and biome-specific N deposition effects on C sequestration rates with the dynamic global vegetation model LPJ-GUESS. Modeled CN interactions are evaluated by comparing predictions of the C and CN version of the model with direct observations of C fluxes from 68 forest FLUXNET sites. N limitation on C uptake reduced overestimation of gross primary productivity for boreal evergreen needleleaf forests from 56% to 18%, presenting the greatest improvement among forest types. Relative N deposition effects on C sequestration (dC/dN) in boreal, temperate, and tropical sites ranged from 17 to 26 kg C kg N À1 when modeled at site scale and were reduced to 12-22 kg C kg N À1 at global scale. We find that 19% of the recent (1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007) and 24% of the historical global C sink was driven by N deposition effects. While boreal forests exhibit highest dC/dN, their N deposition-induced C sink was relatively low and is suspected to stay low in the future as no major changes in N deposition rates are expected in the boreal zone. N deposition induced a greater C sink in temperate and tropical forests, while predicted C fluxes and N-induced C sink response in tropical forests were associated with greatest uncertainties. Future work should be directed at improving the ability of LPJ-GUESS and other process-based ecosystem models to reproduce C cycle dynamics in the tropics, facilitated by more benchmarking data sets. Furthermore, efforts should aim to improve understanding and model representations of N availability (e.g., N fixation and organic N uptake), N limitation, P cycle dynamics, and effects of anthropogenic land use and land cover changes.

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A new mass conservation approach to the study of CO₂ advection in an alpine forest

Cited by 77 publications

References 120 publications

Application of a mass consistent flow model to study the CO2 mass balance of forests

Application of a mass consistent flow model to study the CO2 mass balance of forests

Global parameterization and validation of a two‐leaf light use efficiency model for predicting gross primary production across FLUXNET sites

Low historical nitrogen deposition effect on carbon sequestration in the boreal zone

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A new mass conservation approach to the study of CO2 advection in an alpine forest

Cited by 77 publications

References 120 publications

Application of a mass consistent flow model to study the CO2 mass balance of forests

Application of a mass consistent flow model to study the CO2 mass balance of forests

Global parameterization and validation of a two‐leaf light use efficiency model for predicting gross primary production across FLUXNET sites

Low historical nitrogen deposition effect on carbon sequestration in the boreal zone

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A new mass conservation approach to the study of CO₂ advection in an alpine forest